Look at the post data as it resides in the DB by using the phpMyAdmin app.
If post content is truly empty here, the import has failed. Then the importer’s forum is the right place to find a solution.
It could be that posts were composed with some sort of page builder. Without the page builder being active, posts might appear to be empty, the content as saved in the DB might be entirely composed of special HTML comments that mean nothing without the associated page builder. In this case, you need to install the same page builder.
In the future, please refrain from cross posting in multiple forums. You would usually just get referred back to the dedicated support forum anyway.
I eventually figured it out, so tagging this as assigned – thanks for the answer, i’ll definitely just post on forum going forward.